Membrane Structure And Function

Front 1

Membranes are made from:

Back 1

Lipids proteins and sometimes carbohydrates.

Front 2

Define a phospholipid and a phospholipid bilayer:

Back 2

Phospholipids are molecules which are both hydrophobic and hydrophilic. Hydrophobic tails and hydrophilic heads. A bilayer is when the create a membrane with all tails in an all heads out. This has a hydrophobic core.

Front 3

Describe the fluid mosaic model of a membrane:

Back 3

membranes consist of bi-layer lipids with free moving proteins held within.

Front 4

Where does membrane synthesis occur:

Back 4

On the cytosolic face of endoplasmic reticulum. Then moved my "flippases" protein. Membrane PROTEINS begin on cystolic ribosomes.

Front 5

Proteins determine membrane function. Explain the difference between integral membrane proteins and channel proteins.

Back 5

Integral membrane proteins span the width of the membrane appearing on both sides and contain a hydrophobic core. Channel proteins also span the width of the membrane and have a hydrophobic core but a hydrophilic passage in the middle to allow the transport of materials.

Front 6

Transport proteins can move solute:

Back 6

with or against a concentration gradient with the use of ATP.

Front 7

Signal transduction:

Back 7

produce hormones that circulate in the blood stream and are recognised by receptor proteins.

Front 8

Membrane proteins are important in:

Back 8

Cell - Cell recognition and Cell - Solute recognition.
Attachment to cytoskeleton.
Membrane permeability (allowing non polar substances across the membrane) allowing passive and active transport.

Front 9

Tonicity:

Osmosis:

Hypotonic:

Back 9

is the ability of a solution to make a cell lose or gain water and influences cell behaviour.
Movement of water due to solute concentration.

When the concentration of a solute inside of the cell is higher than outside. Water will flow into the cell causing rupture.

Front 10

Isotonic:

Back 10

No net movement of water, this is what animals are working towards however in plants would cause a flaccid cell.

Front 11

Action potentials, ions make the inside of a cell more -ve than the outside due to:

Back 11

Electronegative ion pumps (sodium potassium ion pump)

Front 12

Movement of large molecules across a membrane is done by:

Back 12

Endo and exocytosis.